A display panel, a packaging method thereof, and a display device having same are described. The display panel has: a substrate having a display region and a non-display region surrounding the display region; electrode lines distributed on a surface of the substrate, and located within the display region; a package covering plate attached to the surface of the substrate having the electrode lines; a double-sided sealant adhered to the package covering plate and the surface of the substrate having the electrode lines; a conductive nanofiber layer disposed between the double-sided sealant and the substrate, and located on the electrode lines of the display region. The conductive nanofiber layer can achieve good surface contact and parallel connection with the electrode lines. Therefore, surface resistance of the electrode lines in the display panel is effectively reduced, and luminous efficiency and brightness uniformity of the display panel are improved.